<http://schema.org/headline>
"\u304D\u308C\u3044\u306A\u66F8\u985E\u3084\u304A\u77E5\u3089\u305B\u3092\u4F5C\u308B\u30B3\u30C4\u3092\u6559\u3048\u307E\u3059\uFF1A\u65B0\u520A\u30D4\u30C3\u30AF\u30A2\u30C3\u30D7"^^<http://www.w3.org/2001/XMLSchema#string>
<http://gihyo.jp/book/pickup/2015/0006>